US5664484A - Frying apparatus and process - Google Patents

Frying apparatus and process Download PDF

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Publication number
US5664484A
US5664484A US08/523,822 US52382295A US5664484A US 5664484 A US5664484 A US 5664484A US 52382295 A US52382295 A US 52382295A US 5664484 A US5664484 A US 5664484A
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US
United States
Prior art keywords
tray
food pieces
axle
assembly
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/523,822
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English (en)
Inventor
Slobodan Milohanic
Lars Moeller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nestec SA
Original Assignee
Nestec SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nestec SA filed Critical Nestec SA
Assigned to NESTEC S.A. reassignment NESTEC S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MILOHANIC, SLOBODAN, MOELLER, LARS
Application granted granted Critical
Publication of US5664484A publication Critical patent/US5664484A/en
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Expired - Fee Related legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/12—Deep fat fryers, e.g. for frying fish or chips
    • A47J37/1214—Deep fat fryers, e.g. for frying fish or chips the food being transported through an oil-bath
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/04—Roasting apparatus with movably-mounted food supports or with movable heating implements; Spits
    • A47J37/044—Roasting apparatus with movably-mounted food supports or with movable heating implements; Spits with conveyors moving in a horizontal or an inclined plane

Definitions

  • the present invention relates to a frying apparatus and process.
  • the usual frying methods nowadays are deep-fat frying, belt frying (on a TELFLON or steel belt) and drum frying.
  • the frying of spherical pieces or mixtures of different ingredients is mostly effected by deep-fat frying which is not only undesirable from a health point of view, but also imparts an oil-like taste to the product.
  • the frying of meatballs may be carried out in a drum fryer, but this method suffers from the disadvantage of overheated oil occuring at those parts of the drum not covered by the product.
  • a product consisting of different ingredients which require different frying times, it is difficult to add the new ingredients during the frying and although it is possible to use two or more fryers, this adds to the costs and it is also necessary to provide separate mixers between the fryers.
  • a fryer comprising:
  • a tray for containing a frying oil on its surface and a product to be surface fried, means for conveying and mixing the product horizontally from an inlet position to an outlet position and simultaneously cleaning the frying surface of the tray,
  • the present invention also provides a process for surface-frying a food product which comprises conveying the food product horizontally from an inlet position to an outlet position in a tray whose surface is coated with frying oil while simultaneously mixing the product and cleaning the frying surface of the tray and controlling the period of time during which the product contacts the frying oil in order to obtain a fried surface of the product.
  • the tray may be made of any material suitable for a frying process, e.g. a metal such as steel. It is preferably elongated in shape and may be in the form of a shallow trough, the frying surface of which is concave in cross-section. Preferably, the tray is adapted to remain stationary or substantially stationary during frying of the product.
  • a metal such as steel. It is preferably elongated in shape and may be in the form of a shallow trough, the frying surface of which is concave in cross-section.
  • the tray is adapted to remain stationary or substantially stationary during frying of the product.
  • the means for heating the frying oil may be achieved by the provision of a double wall in the tray through which hot oil flows.
  • the hot oil may be heated either by a heat exchanger connected to steam under pressure, e.g. 20 bars, or directly from an oil burner.
  • the double will does not extend above the level of the product within the tray in order to protect the frying oil from overheating on the surface of the tray which would not be covered by the product.
  • One means for conveying and mixing the product may be, for example, provided by a shaft fitted with angled paddles in a helical arrangement extending from an inlet end to an outlet end within the tray and adapted to rotate so that their edges contact and scrape the frying surface of the tray.
  • the paddles are advantageously slightly curved so that their edges which contact the frying surface of the tray will transport the product and clean the frying surface of the tray by scraping.
  • the rotation of the shaft forces the product from the inlet position to the outlet position and also enables mixing of the product by the action of the paddles.
  • the scraping action of the edges of the paddles on the frying surface of the tray enables the frying surface to remain clean.
  • Means for rotating the shaft may be provided by a drive motor attached to one end of the shaft.
  • the means for controlling the period of time during which the product remains in contact with the frying oil in order to achieve a fried surface of the product may be provided by a discontinuous movement of the rotation of the shaft.
  • the discontinuous movement may be achieved, for instance, by a computer connected to the drive motor and may be adjusted according to the nature of the product to be fried.
  • the discontinuous rotation helps to achieve a fried surface on the product.
  • the speed of the rotation is not critical but may be chosen according to the mixing capacity and/or the fragility of the product and may be, for instance, from 5 to 100 and preferably from 10 to 50 RPM.
  • the duration of each period of discontinuous rotation of the shaft is not critical but is usually from 5 to 60 seconds, e.g. from 10 to 40 seconds. Each period of rotation may be separated by a period of from 10 seconds to 5 minutes, preferably from 30 seconds to 3 minutes during which time the shaft is stationary.
  • An alternative means for conveying and mixing the product may be provided by a central axle adapted to rotate and extending horizontally from a tray inlet end to an outlet end fitted with a plurality of plates, or wings, projecting substantially perpendicularly from the central axle and positioned at an angle in the perpendicular plane so that on rotation of the axle, the movement of a plate transports the product a certain distance corresponding to the width of the angle.
  • the alternative means may also comprise a scraper to clean the frying surface, a mixing plate to lift and turn the product while rotating and a level-out system, such as an articulated level-out system positioned on the opposite side of the axle to the plates or wings, to maintain a desired thickness of the product layer on the frying surface of the tray.
  • the tray preferably consists of two double jacketed tubs in two levels, preferably tightly mounted to each other, each tub being separately heated with thermal oil.
  • the downstream tub is preferably at a lower level to the upstream tub.
  • the central axles in each tub are adapted to rotate clockwise and anti-clockwise and are separately driven, e.g. by two computer controlled servo-motors.
  • the plates or wings in the downstream tub are mounted at a narrower angle in the perpendicular plane than the plates in the upstream tub and therefore one rotation of the central axle transports the product less distance in the downstream tub than in the upstream tub.
  • This arrangement in the downstream tub therefore requires more turns than the arrangement in the upstream tub to transport the food product a specified distance in the tray, e.g.
  • the tray is divided into two parts with the plates in the downstream tub mounted at a narrower angle than those in the upstream tub is because it is necessary that the product lies still on the frying surface of the tray for specified periods during frying in order to achieve an attractive browning. During frying the product becomes hotter and therefore the resting time on the frying surface of the tray should preferably be shorter in order to avoid burned and/or destroyed portions.
  • the plates are each conveniently segments of an ellipsoid plane section, preferably from 1/5 to 1/2 and more preferably from 2/9 to 4/9 of the ellipsoid plane section.
  • the plates are preferably connected to one another by means of one or more connecting rods or stay tubes to give stability.
  • the frying oil is added to the tray and heated to the frying temperature before the product is added.
  • the amount of frying oil added to the tray depends on the product but may be from 0.5 to 10%, usually from 1 to 6% and more usually from 1.5 to 4% by weight based on the weight of product being fried.
  • Examples of products which may be fried by the apparatus and process of this invention include meat balls, diced potatoes and products containing a mixture of ingredients such as the Swedish "Pyttipanna” or Chinese types of stir fries.
  • a product contains a mixture of ingredients which require different frying times, it is easy to add the ingredients which require shorter frying times at the appropriate position between the inlet and outlet positions of the tray.
  • the process of the present invention may be carried out batchwise or continuously.
  • the product can be added simply by dropping it into the tray.
  • the batches may conveniently be weighed manually and added by a semi-automatic device such as a screw feeder.
  • weighing belts may be used to add the product to the tray.
  • FIG. 1 is a perspective view of a fryer according to the present invention which illustrates one embodiment for conveying and mixing food pieces during frying.
  • FIG. 2 is a diagrammatic side view of a second embodiment for conveying and mixing a food product during frying.
  • FIG. 3 is a lateral cross-sectional view of the conveying and mixing means of FIG. 2.
  • FIG. 4 is a section of FIG. 3 as indicated by line 4--4.
  • FIG. 5 is a side view of a fryer according to the present invention which illustrates a third embodiment for conveying and mixing food pieces during frying.
  • FIG. 6 is a plan view of the fryer of FIG. 5.
  • FIG. 7 is a lateral cross-sectional view of the fryer of FIG. 6.
  • FIG. 8 is a series of lateral cross-sectional views of the fryer of FIG. 6 which shows a cycle of the means for conveying and mixing food pieces during frying.
  • the fryer generally designated 10, comprises an elongated tray 11 having a frying surface 12 which is concave in cross-section and provided with a heating jacket 13, through which flows heating oil via inlet 14 and outlet 15, and a heat exchanger 16 connected to steam at twenty bar pressure.
  • the tray 11 is provided with holes 17, 18 at each end through which passes a shaft 19 adapted to rotate and fitted with angled paddles 20 which are attached in pairs to the shaft 19 at the mid-point of their lengths by means of an rod 21.
  • each paddle facing the frying surface 12 is curved in a convex manner so that when the shaft rotates, the convex long edge of the paddle 20 corresponds to the concave frying surface 12 and is adapted to contact and scrape the frying surface.
  • One end 22 of the shaft is connected to a drive motor 23 by means of a drive belt 24. The product is fed into the tray at an inlet position 25 and is passed out of the tray at an outlet position 26.
  • heating oil is passed through the heating jacket 13, frying oil is placed in the tray to cover the frying surface 12, the drive motor 23 rotates the shaft 19 discontinuously, with rotation at 20 RPM for 10 seconds and with a one or two minutes rest period in between, and meat balls are fed into the tray at the inlet position 25.
  • the rotation of the shaft 19 and the paddles 20 forces the meat balls along the tray from the inlet position 25 to the outlet position 26 while they are mixed and fried by the frying oil and simultaneously, the curved outer long edges of the paddles 20 scrape and clean the frying surface 12.
  • the discontinuous rotation of the shaft is controlled by a computer (not shown) and ensures that the meat balls are fried for the desired length of time before exiting the tray 11 at the outlet position 26.
  • the frying oil is first added to the tray and heated to the frying temperature.
  • the potatoes are added and the shaft 19 is rotated at 20 RPM for 10 seconds with a one or two minutes rest period in between.
  • the potatoes are fried for 6 minutes during which time they are transported to a position nearly half way along the tray. At this position, the onions, meat and spices are added and fried together with the potatoes for a further 8 minutes.
  • each ingredient On reaching the outlet position 26, each ingredient has been fried for the desired length of time.
  • the frying oil does not become overheated as in a drum fryer and the fryer is more efficient and energy saving than conventional fryers.
  • the shaft 27 adapted to rotate is fitted with curved angled paddles 28 each consisting of an anchor rod 29, an anchor plate 30 and a scraping plate 31.
  • Each paddle is attached to the shaft 27 by means of the anchor shaft 29.
  • the fryer comprises two trays 32, 33 each having a frying surface 34, 35 which is concave in cross-section and provided with a heating jacket (not shown) through which flows heating oil via an inlet and an outlet (not shown), and a heat exchanger (also not shown) connected to steam at 20 bar pressure.
  • Each tray is provided with a axle 36, 37 one end of each of which 38, 39 is separately connected to a computer controlled servo-motor (not shown) which is adapted to rotate the axles both clockwise and anti-clockwise.
  • each axle 36, 37 Mounted on each axle 36, 37 are a plurality of wings (plates) 40, 41 for transportation, each wing being a 1/3 segment of an ellipsoid plane section, each wing projecting transversely from the axle and positioned at an angle to a plane formed by a lateral cross-section of the axle the angle of the wings 40 being wider than that of the wings 41 so that on rotation of the respective axles two turns of axle 37 are required to transport the product the same distance as only one turn of axle 36,
  • the wings 40, 41 are connected to each other by four stay tubes 42, 43 respectively. Each wing is provided with a scraper 44 to clean the frying surface and a mixing plate 45 to lift and turn the product.
  • An articulated level-out system 46 is mounted on each axle on the opposite side to the wings. Dosing points for potatoes, onions and meat are shown at 47, 48, 49, the product is shown at 50 and the final fried product outlet is shown at 51.
  • heating oil is passed through the heating jacket, frying oil is placed in each of the trays 32, 33 to cover the frying surfaces 34, 35 and the servo-motors rotate the axles in accordance with the function illustrated in FIG. 8.
  • the fryer can be divided into sections where each section is the distance between an adjacent pair of wings 40, 41.
  • the product is transported stepwise from section to section by an intermittent rotation of the axles, in the direction of the arrows to the right in the drawings, the distance travelled by the product during one whole turn of the axle (360°) depending on the angle of the wings.
  • FIG. 8 illustrates five steps as follows:
  • the bottom of the fryer is "free".
  • the axle 36 is in its zero position
  • the axle 36 turns clockwise 105° and returns thereafter to zero position to level out the product, the thickness of the product layer 50 being reduced by increasing the length of the articulated level-out system 46.
  • the product 50 is lying stationary at the bottom of the fryer. Resting time for "pyttipanna" is 120 s in the first part and 60 s in the second part of the fryer.
  • the axle 36 turns counter-clockwise 360°, and the wing 40 transports the product one section.
  • the rotation speed is 60° per second, i.e. a complete revolution takes 6 seconds.
  • the level-out system glides over the product and thus does not affect the thickness. Since the plate 40 is mounted at an angle in the perpendicular plane, the product is pushed to the side of the fryer at the same time as it is transported forward.
  • the axle 36 turns clockwise 105° (this takes slightly less than 2 seconds) and return thereafter to zero position to level out the product by means of the level-out system 46 to maintain a specified thickness of the product layer on the bottom of the fryer.
  • Points 1-5 can be described as one cycle, total frying time for the product is 12 cycles (four cycles ⁇ 128 s in the first part and eight cycles ⁇ 68 sec in the second part).

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Frying-Pans Or Fryers (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Fats And Perfumes (AREA)
  • Baking, Grill, Roasting (AREA)
  • Glass Compositions (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Meat, Egg Or Seafood Products (AREA)
US08/523,822 1994-09-22 1995-09-06 Frying apparatus and process Expired - Fee Related US5664484A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP94114931 1994-09-22
SE94114931 1994-09-22

Publications (1)

Publication Number Publication Date
US5664484A true US5664484A (en) 1997-09-09

Family

ID=8216308

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Application Number Title Priority Date Filing Date
US08/523,822 Expired - Fee Related US5664484A (en) 1994-09-22 1995-09-06 Frying apparatus and process

Country Status (15)

Country Link
US (1) US5664484A (cs)
EP (1) EP0702922B1 (cs)
JP (1) JP3696667B2 (cs)
AT (1) ATE175087T1 (cs)
AU (1) AU698427B2 (cs)
CA (1) CA2158787C (cs)
DE (1) DE69506977T2 (cs)
DK (1) DK0702922T3 (cs)
ES (1) ES2127464T3 (cs)
FI (1) FI111799B (cs)
GR (1) GR3029340T3 (cs)
NO (1) NO310392B1 (cs)
PH (1) PH31369A (cs)
SG (1) SG33503A1 (cs)
TW (1) TW290435B (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU675672B2 (en) * 1992-12-31 1997-02-13 Mcneil-Ppc, Inc. Method and system for making three-dimensional fabrics
EP1741370A1 (fr) * 2005-07-08 2007-01-10 Rosinox Dispositif de cuisson du type sauteuse-braisière parallélipipédique équipé de moyens de brassage du contenu
WO2009118011A1 (en) * 2008-03-28 2009-10-01 Gastroprocess Technologies A/S An apparatus for stir-frying
US7981455B2 (en) * 2002-04-22 2011-07-19 Restaurant Technology, Inc. Automated food processing system and method
CN111990418A (zh) * 2020-08-11 2020-11-27 李辉 一种自动炸串机
US20220258199A1 (en) * 2017-03-30 2022-08-18 Robert G. Nothum, Jr. Work-saving improvements for food-process lines

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3255866B2 (ja) * 1997-01-30 2002-02-12 カゴメ株式会社 食品材料の連続煎炒装置
EP1790261A1 (en) * 1997-12-09 2007-05-30 Jens Adler-Nissen A method and apparatus for stir-frying
EP2375946A1 (en) * 2008-11-14 2011-10-19 Gastroprocess Technologies A/S Flexible screw and scraper arrangement for a contact frying apparatus

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB639895A (en) * 1946-12-11 1950-07-05 Wilhelmus Antonius Visser Apparatus for frying fish and such materials
US2610033A (en) * 1946-10-22 1952-09-09 Rietz Mfg Co Heat exchange screw conveyer
US2643603A (en) * 1950-10-19 1953-06-30 Musa S Balluteen Cooking machine
US3585923A (en) * 1968-10-21 1971-06-22 Leo R Waller Automatic food fryer
US3616747A (en) * 1969-03-26 1971-11-02 Laitram Int Archimedean screw type cooker conveyor
US3826184A (en) * 1972-09-26 1974-07-30 T Shotton Conveyor-type cooking device
US4181072A (en) * 1977-06-06 1980-01-01 Fmc Corporation Continuous pressure cooking apparatus
US4228730A (en) * 1979-03-30 1980-10-21 Restaurant Technology, Inc. Automatic french fryer
US5253567A (en) * 1993-03-05 1993-10-19 Stein, Inc. Thermal fluid heat exchanger for deep fat fryer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722401A (en) * 1968-05-17 1973-03-27 Lamb Weston Inc Apparatus for processing edible foodstuffs
FR2091168A5 (cs) * 1971-05-04 1972-01-14 Laitram Int
DE2247122A1 (de) * 1972-09-26 1974-03-28 Frans Marcelissen Verfahren und vorrichtung zum herstellen von backprodukten fuer die industrielle fertigung, insbesondere pommes frites, kartoffelchips od.dgl
AU493584B1 (en) * 1974-03-06 1976-09-09 Richard Chappell Donald Improved method and apparatus for frying foodstuff

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610033A (en) * 1946-10-22 1952-09-09 Rietz Mfg Co Heat exchange screw conveyer
GB639895A (en) * 1946-12-11 1950-07-05 Wilhelmus Antonius Visser Apparatus for frying fish and such materials
US2643603A (en) * 1950-10-19 1953-06-30 Musa S Balluteen Cooking machine
US3585923A (en) * 1968-10-21 1971-06-22 Leo R Waller Automatic food fryer
US3616747A (en) * 1969-03-26 1971-11-02 Laitram Int Archimedean screw type cooker conveyor
US3826184A (en) * 1972-09-26 1974-07-30 T Shotton Conveyor-type cooking device
US4181072A (en) * 1977-06-06 1980-01-01 Fmc Corporation Continuous pressure cooking apparatus
US4228730A (en) * 1979-03-30 1980-10-21 Restaurant Technology, Inc. Automatic french fryer
US5253567A (en) * 1993-03-05 1993-10-19 Stein, Inc. Thermal fluid heat exchanger for deep fat fryer

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU675672B2 (en) * 1992-12-31 1997-02-13 Mcneil-Ppc, Inc. Method and system for making three-dimensional fabrics
US7981455B2 (en) * 2002-04-22 2011-07-19 Restaurant Technology, Inc. Automated food processing system and method
EP1741370A1 (fr) * 2005-07-08 2007-01-10 Rosinox Dispositif de cuisson du type sauteuse-braisière parallélipipédique équipé de moyens de brassage du contenu
FR2888102A1 (fr) * 2005-07-08 2007-01-12 Rosinox Sa Dispositif de cuisson du type sauteuse-braisiere parallepipedique equipe de moyens de brassage du contenu
WO2009118011A1 (en) * 2008-03-28 2009-10-01 Gastroprocess Technologies A/S An apparatus for stir-frying
US20110023725A1 (en) * 2008-03-28 2011-02-03 Gastroprocess Technologies A/S apparatus for stir-frying
CN101980642A (zh) * 2008-03-28 2011-02-23 加斯特奥普罗赛斯技术有限公司 用于搅拌烹炒的设备
US20220258199A1 (en) * 2017-03-30 2022-08-18 Robert G. Nothum, Jr. Work-saving improvements for food-process lines
US12097526B2 (en) * 2017-03-30 2024-09-24 Robert G. Nothum, Jr. Work-saving improvements for food-process lines
CN111990418A (zh) * 2020-08-11 2020-11-27 李辉 一种自动炸串机
CN111990418B (zh) * 2020-08-11 2022-06-28 浙江格洛里门业有限公司 一种自动炸串机

Also Published As

Publication number Publication date
DE69506977T2 (de) 1999-05-27
DE69506977D1 (de) 1999-02-11
ES2127464T3 (es) 1999-04-16
DK0702922T3 (da) 1999-08-30
TW290435B (cs) 1996-11-11
AU698427B2 (en) 1998-10-29
NO953725D0 (no) 1995-09-21
CA2158787C (en) 2008-01-15
NO953725L (no) 1996-03-25
FI954408L (fi) 1996-03-23
JPH08266425A (ja) 1996-10-15
NO310392B1 (no) 2001-07-02
FI111799B (fi) 2003-09-30
FI954408A0 (fi) 1995-09-19
SG33503A1 (en) 1996-10-18
EP0702922B1 (en) 1998-12-30
JP3696667B2 (ja) 2005-09-21
CA2158787A1 (en) 1996-03-23
AU3060195A (en) 1996-04-04
GR3029340T3 (en) 1999-05-28
ATE175087T1 (de) 1999-01-15
EP0702922A1 (en) 1996-03-27
PH31369A (en) 1998-08-12

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